Answer :

The series which consists of similar structures and similar chemical properties in which the successive compounds differs by a CH2 group is termed as homologous series.

The two consecutive members of homologous series are:

1. Methane CH4

2. Ethane C2H6

The members of the homologous series consist of same general formula such as Alkanes have general formula CnH2n+2 and the two adjacent homologues have a difference of molecular mass of 14 u. Therefore, the members of the homologous series shows a change in the physical properties with increase in the molecular mass.

Since the structure of the compounds of homologous series is similar, so they have similar chemical properties.

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